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-rw-r--r--ext/extmk.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/extmk.rb b/ext/extmk.rb
index d7d4d2fbd2..dd3bcfeb2e 100644
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -117,7 +117,7 @@ def extmake(target)
unless $ignore
Config::CONFIG["srcdir"] = $srcdir
Config::CONFIG["topdir"] = $topdir
- CONFIG["hdrdir"] = ($hdrdir == top_srcdir) ? top_srcdir : "$(topdir)/"+top_srcdir
+ CONFIG["hdrdir"] = ($hdrdir == top_srcdir) ? top_srcdir : "$(topdir)"+top_srcdir[2..-1]
CONFIG["srcdir"] = "$(hdrdir)/ext/#{$mdir}"
CONFIG["topdir"] = $topdir
begin